Inactivation of Escherichia coli O157:H7 in hamburgers by gamma irradiation - Chirinos, Rodolfo Raúl Orejuela; Vizeu, Dirceu Martins; Destro, Maria Teresa; Franco, Bernadette Dora Gombossy de Melo; Landgraf, Mariza (Brazilian Journal of Microbiology, 2002)